Item # 1: ( 490 - 43 ) , Instrument based on eddy current principles, suitable to measure coating thickness accurately. Conforming with ASTM E376-19, B244, B499, B530, D7091 Gauge's measurement ranges from 0 to 25mm with +- (1% or 0.015mm) accuracy. With metric/Imperial Units. Capable of measuring non-magnetic coatings on ferrous and non-ferrous substrates. With probes ideal for measuring coatings on curved or flat surfaces. With multiple stored calibration adjustments for measuring on a variety of substrate condition. Guage can store at least 1000,000 readings in at least 500 sequential/grid batches. Instantly calculate average, standard deviation, min/max thickness and number of reading while measuring. With USB Port and cable for quick connection to a PC and for continuous power. Full color screen with backlight